Often in American politics, we find ourselves in an absurd position of voting for someone we dislike to keep someone we hate out of office.
Instant run-off voting is the first step to solving this issue. It allows for candidates to be ranked according to preference, and at each step the candidate with the lowest votes is eliminated until a clear majority is attained. This will make third parties a viable option in the US. Because you're not faced with having to play game theory in order to get a good result. No long will a vote for Nader be a vote for Bush. Or a vote for Perot be a vote for Clinton.